Consider the following questions:
Is NY City livable? Why or why not?
If it meets the criteria for livability, discuss why.
Is there anything that we can do to improve improve livability?
If the city is not livable, discuss why it does not meet the criteria. Then, suggest ways to make the city livable.
It is quite possible that you could end up with a "mixed bag:" a city that is livable in certain aspects (economy, recreation opportunities), but is not livable with respect to crime, pollution. Discuss how the non-livable aspects could be improved.